压力铸造对亚共晶Al-11Si-1.8Cu合金的组织细化作用

Structure Refining Effect of Die Casting on the Hypoeutectic Al-11Si-1.8Cu Alloy

以亚共晶铸造Al-11Si-1. 8Cu合金为研究对象,基于普通重力铸造和高压压力铸造条件下合金的组织分析,研究了压力铸造对亚共晶Al-11Si-1. 8Cu合金的组织细化作用,结果表明:与普通重力铸造相比,压力铸造不但能明显细化亚共晶Al-11Si-1. 8Cu合金组织中的初生a-Al和共晶Si相,还使合金组织中初生a-Al相的形态由树枝状转变成了球状,并且随着高压压铸压力的增大,初生a-Al相的球状形态越圆整和细小,同时合金组织中共晶Si相的析出也明显受到抑制。

On the basis of different casting conditions such as normal gravity casting and high pressure die casting, the structure refining effect of die casting on the hypoeutectic Al-11Si-1.8Cu alloy is investigated by structure analysis. The research results indicate that compared with normal gravity casting, die casting can obviously refine the primary a-Al and eutectic Si phase of Al-11Si-1.8Cu alloy, and the morphology of primary a-Al changed from dendrite shape to spherical shape. Furthermore, under the condition of high pressure die casting, with the casting pressure increasing, the spherical morphology and size of primary a-Al are more round and small respectively, and the precipitaion of eutectic Si phase is suppressed simultaneously.